H-bridge cascaded SVG parallel harmonic circulation suppression method
A technology of harmonic circulation and parallel connection, which is applied in the direction of harmonic reduction device, AC network to reduce harmonic/ripple, AC network circuit, etc. Problems such as disconnection
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[0034] The present invention assumes that there are n cascaded valve groups on each phase of each SVG, and the phase difference corresponding to each valve group carrier is fixed under the single-stage frequency multiplication carrier phase-shift modulation method (Set a bipolar carrier cycle as 2π), because the initial phases of different SVG carriers are different, resulting in phase deviation between the carrier of different SVGs and the SPWM control signal compared with even the same modulation wave, set each phase between two SVGs The overall carrier phase deviation angle of n in series is δ.
[0035] The steps are:
[0036] Step 1. Assume that the fundamental output voltages of the grid side and the three-phase A, B, and C phases of the SVG are completely symmetrical and run in a steady state;
[0037] Step 2. Directly change the triangular carrier frequency according to a certain time, reduce the phase difference of the parallel SVG carrier until the two carriers are ...
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